Assertion :Adiabatic expansion is always accompanied by fall in temperature. Reason: In adiabatic process, volume is inversely proportional to temperature.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
An adiabatic process is one that occurs without transfer of heat between a thermodynamic system and its surroundings; energy is transferred only as work.
The adiabatic compression of a gas causes a rise in temperature of the gas. Adiabatic expansion against pressure, or a spring, causes a drop in temperature.
Also,
In adiabatic process, volume and temperature are inter-related as

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